Fluoropolymer coating composition
AssigneeHoechst Aktiengesellschaft
InventorBernhard Jahn
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Abstract
Aqueous fluoropolymer formulations containing in finely divided form from 15 to 75% by weight of a fluoropolymer which preferably has at least 40% by weight of tetrafluoroethylene units, from 0.5 to 10% by weight of an organic compound which has at least two, preferably 2-4, isocyanate groups and, optionally, up to 20% by weight of auxiliary or additive substances are prepared and used for coating yarn, in particular sewing yarn, and textile sheet materials.
Claims11
A textile sheet coated or bonded with at least one fluoropolymer layer, the layer immediately adjoining the surface of the sheet being prepared from a formulation comprising a fluoropolymer and an adhesion-promoting constituent selected from the group consisting of 1,5-diisocyanatonaphthalene, dimerized or trimerized diisocyanatoluene, and adducts of diisocyantoluene with trimethylpropane and tris-[isocyanatohexyl]biuret, the adhesive strength of the layer to the sheet being at least 10 daN/5 cm as determined by DIN 53 530.
A yarn comprising synthetic fibers or filaments coated with a fluoropolymer layer, the layer being prepared from a formulation comprising a fluoropolymer and an adhesion-promoting constituent selected from the group consisting of 1,5-diisocyanatonaphthalene, dimerized or trimerized diisocyanatoluene, and adducts of diisocyantoluene with trimethylpropane and tris[isocyanatohexyl]biuret, the adhesive strength of the layer to the yarn being sufficient to withstand mechanical stress when the yarn is further processed.
Dependencies are inferred from the claim text.